20729467 has 8 divisors (see below), whose sum is σ = 22697280. Its totient is φ = 18775560.

The previous prime is 20729419. The next prime is 20729479. The reversal of 20729467 is 76492702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20729467 - 2⁷ = 20729339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20729407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (2837160).

Almost surely, 2^20729467 is an apocalyptic number.

20729467 is a deficient number, since it is larger than the sum of its proper divisors (1967813).

20729467 is a wasteful number, since it uses less digits than its factorization.

20729467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 20729467 is about 4552.9624421908. The cubic root of 20729467 is about 274.7025632604.

The spelling of 20729467 in words is "twenty million, seven hundred twenty-nine thousand, four hundred sixty-seven".